<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<input type="button" value="Texto" onclick="mensagem();" />

<div id="divMensagem"></div>

<input type="reset" value="Limpar"/>
<input type="submit" value="Atualizar"/>

</body>
</html>

<script type="text/javascript">
function mensagem() {
	var xmlhttp;
	
	if (window.XMLHttpRequest) {
		xmlhttp = new XMLHttpRequest();
	}
	
	xmlhttp.onreadystatechange = function () {
		if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
			document.getElementById("divMensagem").innerHTML = xmlhttp.responseText;
		}
	}
	
	xmlhttp.open ("GET", "http://localhost:8080/AloMundoAJAX/ServletMensagem", true);
	xmlhttp.send();
	
}
</script>